2.02 heads on my 307? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

pat123 · 03-29-2009, 10:06 PM

can it be done?

Chevymann1968 · 03-29-2009, 10:14 PM

I dont see why not!!!! I ran some 2.02 1.60s on a 327 350 385 stroker!!!

lpaine · 03-29-2009, 10:21 PM

You might have valve size problems with those heads on that block, that is the valves are actually too big to fit the smaller cylinder bore of the 307, I could be completely wrong though, someone else will chime in on this for sure.

pat123 · 03-29-2009, 10:17 PM

so i wont have a problem with valve clearance?

**Ricks1971** · 03-29-2009, 10:20 PM

what size chambers do you have on the 2.02 heads? 2.02 valves in 76 cc heads are great but with 64 chamber heads tend to bring your compression up.

Chevymann1968 · 03-29-2009, 10:21 PM

What kind of pistons are you running? I always ran flat tops!!!

pat123 · 03-29-2009, 10:24 PM

probably 70cc chambers, and running flat top pistons.
i was wondering about the valves not clear the cylinder, thats why i posted lol

Chevymann1968 · 03-29-2009, 10:34 PM

I tried doing some research and i coiuldnt find anything about putting those heads on a 307!!!! Will do some more searching!!! Sorry i thouhgt you was worried about piston clearance!!!

Chevymann1968 · 03-29-2009, 10:46 PM

Super Chevy did a build on a 307 Here is the right up!!!!
http://www.superchevy.com/technical/...nce/index.html

cdowns · 03-29-2009, 10:51 PM

if in doubt take the bare block put the heads on and look up the bore with a flashlight

pat123 · 03-30-2009, 12:10 AM

sounds good cdowns
im actually trying to figure out what i want on it
i posted a while back about what to do with my 307 and everyone said vortec but im thinking either 1.92 or 2.02 edelbrocks

bhoeger70 · 03-30-2009, 07:50 AM

If I am correct the 2.02 valves will clear but they will be so close to the cylinder wall that the intake valve will be shrouded and a 1.94 valve will flow better.

Skirkpat · 03-30-2009, 10:16 PM

Quote:

Originally Posted by pat123

sounds good cdowns
im actually trying to figure out what i want on it
i posted a while back about what to do with my 307 and everyone said vortec but im thinking either 1.92 or 2.02 edelbrocks

Everyone told me Vortecs? so why would you put 2.02's on it, bigger is not always better, right ?

bowtiedude · 03-30-2009, 10:33 PM

Do not use 2.02's on a small bore block there is a strong possibility of contact of the valve face with the bore.

68Stepbed · 03-30-2009, 08:11 AM

You're going to to have valve "shrouding" which basically means the valve will be so close to the edge of the cylinder wall that the flow will be interupted.

The heads used in the Super Chevy article above are Edelbrocks E-Tec heads which are basicaly just an aluminum verson of the Vortecs. They still have the same 1.94/1.55 valves like the GM peices. The aluminum heads might give you a slighter increase in power over the cast iron heads, but not enough for the money spent.

I would say with a mild 262 cam like used above, a set of GM Vortecs, and Edelbrock intake and a good carb, you would still very well be in the 300 hp mark if not just a little higher.

pat123 · 03-30-2009, 09:28 PM

will i need a roller cam for the vortecs?

pat123 · 03-30-2009, 10:31 PM

edelbrock make vortec?

pat123 · 03-30-2009, 11:24 PM

what do you think og these?
http://cgi.ebay.ca/SBC-CHEVY-ALUMINU...1%7C240%3A1318

would i have to change my flat top pistons to run pump gas?

bowtiedude · 03-31-2009, 07:40 AM

Quote:

Originally Posted by pat123

what do you think og these?
http://cgi.ebay.ca/SBC-CHEVY-ALUMINU...1%7C240%3A1318

would i have to change my flat top pistons to run pump gas?

190 cc runner is a lot of volume for a small cid engine. You might consider a set of world products SR torquer for a 305.

http://store.summitracing.com/partde...5&autoview=sku

Runner volume is perfect, and with the 67 cc chamber should be good with pump premium.

monte0185 · 03-31-2009, 10:36 AM

You can run 202's on a 307 with no issues. The bore is not as small as most people think. The real problem is your going to be running bigger valves for a setup that really dosent need it. Now if your were running around a 480 or so lift then i could see bigger valves but for your setup i would not spend the money. But thats just my .02 cents and its your money so the real decision is up to you.

pat123 · 03-30-2009, 11:30 PM

something like that except 1.94's

**special-K** · 03-31-2009, 10:57 AM

I built a nice running 307 once and I ran 1.94s.I don`t think you`d see a benefit going with more valve.I`d stay with 1.94s.I think 2.02s will make a bad combination.

bigsnookmaster · 04-01-2009, 08:26 AM

2.02's will be overkill. You would probably be better with the 1.94's. It's all about the combination! Bigger isn't always better, unless it's your bank account!My .02

03-29-2009, 10:06 PM	#1
pat123 Pat Join Date: Jan 2008 Location: canada, bc Posts: 243	2.02 heads on my 307? can it be done?

03-29-2009, 10:14 PM	#2
Chevymann1968 Registered User Join Date: Sep 2008 Location: Houma LA Posts: 193	Re: 2.02 heads on my 307? I dont see why not!!!! I ran some 2.02 1.60s on a 327 350 385 stroker!!! __________________ 1968 GMC Rebuilding Stage 2001 Camaro SS SOLD

03-29-2009, 10:21 PM	#3
lpaine Registered User Join Date: Oct 2002 Location: Parksville, B.C. Canada Posts: 637	Re: 2.02 heads on my 307? You might have valve size problems with those heads on that block, that is the valves are actually too big to fit the smaller cylinder bore of the 307, I could be completely wrong though, someone else will chime in on this for sure. __________________ 1969 G.M.C 3/4 Ton 920 (Canadian Version) 307 3 speed, currently apart 1998 Chevy 1/2 ton ex cab V-6 5 speed 1967 Chevy SWB - project truck; not started just yet

03-29-2009, 10:17 PM	#4
pat123 Pat Join Date: Jan 2008 Location: canada, bc Posts: 243	Re: 2.02 heads on my 307? so i wont have a problem with valve clearance?

03-29-2009, 10:20 PM	#5
Ricks1971 Senior Member Join Date: Mar 2006 Location: Clarkrange Tennessee Posts: 1,787	Re: 2.02 heads on my 307? what size chambers do you have on the 2.02 heads? 2.02 valves in 76 cc heads are great but with 64 chamber heads tend to bring your compression up.

03-29-2009, 10:21 PM	#6
Chevymann1968 Registered User Join Date: Sep 2008 Location: Houma LA Posts: 193	Re: 2.02 heads on my 307? What kind of pistons are you running? I always ran flat tops!!! __________________ 1968 GMC Rebuilding Stage 2001 Camaro SS SOLD

03-29-2009, 10:24 PM	#7
pat123 Pat Join Date: Jan 2008 Location: canada, bc Posts: 243	Re: 2.02 heads on my 307? probably 70cc chambers, and running flat top pistons. i was wondering about the valves not clear the cylinder, thats why i posted lol

03-29-2009, 10:34 PM	#8
Chevymann1968 Registered User Join Date: Sep 2008 Location: Houma LA Posts: 193	Re: 2.02 heads on my 307? I tried doing some research and i coiuldnt find anything about putting those heads on a 307!!!! Will do some more searching!!! Sorry i thouhgt you was worried about piston clearance!!! __________________ 1968 GMC Rebuilding Stage 2001 Camaro SS SOLD

03-29-2009, 10:46 PM	#9
Chevymann1968 Registered User Join Date: Sep 2008 Location: Houma LA Posts: 193	Re: 2.02 heads on my 307? Super Chevy did a build on a 307 Here is the right up!!!! http://www.superchevy.com/technical/...nce/index.html __________________ 1968 GMC Rebuilding Stage 2001 Camaro SS SOLD

03-29-2009, 10:51 PM	#10
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: 2.02 heads on my 307? if in doubt take the bare block put the heads on and look up the bore with a flashlight __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

03-30-2009, 12:10 AM	#11
pat123 Pat Join Date: Jan 2008 Location: canada, bc Posts: 243	Re: 2.02 heads on my 307? sounds good cdowns im actually trying to figure out what i want on it i posted a while back about what to do with my 307 and everyone said vortec but im thinking either 1.92 or 2.02 edelbrocks

03-30-2009, 07:50 AM	#12
bhoeger70 Registered User Join Date: Sep 2007 Location: Grand Forks ND Posts: 434	Re: 2.02 heads on my 307? If I am correct the 2.02 valves will clear but they will be so close to the cylinder wall that the intake valve will be shrouded and a 1.94 valve will flow better. __________________ "Beer is proof that God loves us and wants us to be happy" Ben Franklin 67 Chevy 1/2 lwb, 67 GMC 1/2 lwb (parts)

03-30-2009, 10:33 PM	#14
bowtiedude Registered User Join Date: Nov 2006 Location: Central Pa Posts: 64	Re: 2.02 heads on my 307? Do not use 2.02's on a small bore block there is a strong possibility of contact of the valve face with the bore. __________________ '96 K2500 GMC 6.5 4L80E '88 c1500 RCSB lowered 4 & 6 454 TH700R4 (still being built) '79 K20 Chevy 400 4 spd '69 K20 Chevy 406 4spd '70 K10 Chevy 355 4spd 6 inch lift '70 C-20 (son's truck) originally 292 4spd now a 350 4spd Hey I didn't even want to until you told me I couldn't !

03-30-2009, 08:11 AM	#15
68Stepbed Registered User Join Date: Mar 2005 Location: 10-Uh-See Posts: 5,609	Re: 2.02 heads on my 307? You're going to to have valve "shrouding" which basically means the valve will be so close to the edge of the cylinder wall that the flow will be interupted. The heads used in the Super Chevy article above are Edelbrocks E-Tec heads which are basicaly just an aluminum verson of the Vortecs. They still have the same 1.94/1.55 valves like the GM peices. The aluminum heads might give you a slighter increase in power over the cast iron heads, but not enough for the money spent. I would say with a mild 262 cam like used above, a set of GM Vortecs, and Edelbrock intake and a good carb, you would still very well be in the 300 hp mark if not just a little higher. __________________ Matt 68 C10 stepside, LS1/700R4, TCI Engineering suspension system

03-30-2009, 09:28 PM	#16
pat123 Pat Join Date: Jan 2008 Location: canada, bc Posts: 243	Re: 2.02 heads on my 307? will i need a roller cam for the vortecs?



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03-30-2009, 10:31 PM	#17
pat123 Pat Join Date: Jan 2008 Location: canada, bc Posts: 243	Re: 2.02 heads on my 307? edelbrock make vortec?

03-30-2009, 11:24 PM	#18
pat123 Pat Join Date: Jan 2008 Location: canada, bc Posts: 243	Re: 2.02 heads on my 307? what do you think og these? http://cgi.ebay.ca/SBC-CHEVY-ALUMINU...1%7C240%3A1318 would i have to change my flat top pistons to run pump gas?

03-31-2009, 10:36 AM	#20
monte0185 Registered User Join Date: Oct 2008 Location: Brighton, TN Posts: 1,267	Re: 2.02 heads on my 307? You can run 202's on a 307 with no issues. The bore is not as small as most people think. The real problem is your going to be running bigger valves for a setup that really dosent need it. Now if your were running around a 480 or so lift then i could see bigger valves but for your setup i would not spend the money. But thats just my .02 cents and its your money so the real decision is up to you. __________________ A computer once beat me at chess, but it was no match for me at kick boxing. Duct tape is like the force. It has a light side, a dark side, and it holds the world together.

03-30-2009, 11:30 PM	#21
pat123 Pat Join Date: Jan 2008 Location: canada, bc Posts: 243	Re: 2.02 heads on my 307? something like that except 1.94's

03-31-2009, 10:57 AM	#22
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: 2.02 heads on my 307? I built a nice running 307 once and I ran 1.94s.I don`t think you`d see a benefit going with more valve.I`d stay with 1.94s.I think 2.02s will make a bad combination. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

04-01-2009, 08:26 AM	#23
bigsnookmaster Registered User Join Date: Jan 2008 Location: St.Petersburg,Fl Posts: 1,267	Re: 2.02 heads on my 307? 2.02's will be overkill. You would probably be better with the 1.94's. It's all about the combination! Bigger isn't always better, unless it's your bank account!My .02 __________________ greg http://community.webshots.com/user/68406Stepside

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