HEad ID - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Blackhawkdc · 11-13-2002, 01:33 AM

I've got a set of heads off of an '87 Blazer, 350, TBI. I know its got 1.95/1.55 valves, but what I really need to know is the combustion chamber size and if its worth it to have the heads opened up to larger valves. Anyone got answers? Or maybe a slap in the face? I've got 487x heads on the engine right now and want to increase my compression. Thanks in advance.

bigjimzlll · 11-13-2002, 02:00 AM

do you have the numbers off the TBI heads?..the 487x had 75cc chambers..I dont think any late model 350 heads(except vortecs) had 64cc chambers..the 487s were good heads..made 320 hp on the LT1..you could mill the 487s and get CR up some.
Jim

Blackhawkdc · 11-13-2002, 10:03 AM

the numbers are 14102193

wlarue72 · 11-13-2002, 03:48 PM

www.mortec.com has a pretty good listing of head casting numbers.....combustion chamber sizes and such.

bigjimzlll · 11-13-2002, 04:06 PM

those tbi heads are 72cc approx. i talked to the guys at mortec

11-13-2002, 01:33 AM	#1
Blackhawkdc 440 american Horses Join Date: Mar 2001 Location: Anoka, MN USA Posts: 470	HEad ID I've got a set of heads off of an '87 Blazer, 350, TBI. I know its got 1.95/1.55 valves, but what I really need to know is the combustion chamber size and if its worth it to have the heads opened up to larger valves. Anyone got answers? Or maybe a slap in the face? I've got 487x heads on the engine right now and want to increase my compression. Thanks in advance. __________________ Seth Petro 1969 Chev Short Step 425hp 350, TH400, big tires, fast truck 1979 Pontiac Trans Am 1991 Saturn SL1 - gas mileage! (and free) 1977 Buick LeSabre - for sale May America bless God, and may God bless America

11-13-2002, 02:00 AM	#2
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	do you have the numbers off the TBI heads?..the 487x had 75cc chambers..I dont think any late model 350 heads(except vortecs) had 64cc chambers..the 487s were good heads..made 320 hp on the LT1..you could mill the 487s and get CR up some. Jim __________________ It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA

11-13-2002, 10:03 AM	#3
Blackhawkdc 440 american Horses Join Date: Mar 2001 Location: Anoka, MN USA Posts: 470	the numbers are 14102193 __________________ Seth Petro 1969 Chev Short Step 425hp 350, TH400, big tires, fast truck 1979 Pontiac Trans Am 1991 Saturn SL1 - gas mileage! (and free) 1977 Buick LeSabre - for sale May America bless God, and may God bless America

11-13-2002, 04:06 PM	#5
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	those tbi heads are 72cc approx. i talked to the guys at mortec __________________ It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA

11-13-2002, 03:48 PM	#4
wlarue72 Registered User Join Date: Nov 2002 Location: DFW Texas Posts: 244	www.mortec.com has a pretty good listing of head casting numbers.....combustion chamber sizes and such.



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