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#26 |
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Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: My 377 build.
what trans do you have?
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#27 |
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Join Date: Feb 2011
Location: Brownwood, Texas
Posts: 421
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Re: My 377 build.
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1983 Chevy lwb: 400 sbc destroked to 377, comp cams xe 268, Holley Street Dominator Intake, Holley Street Avenger 670 cfm, headers, flowmasters. SOLD 1998 Trans am, mostly stock with magnaflow catback My build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=454329 |
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#28 |
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Join Date: Jul 2009
Location: washington
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Re: My 377 build.
the vacum modulator and governer control the shifts, do you want it to shift lower or higher? most poeple go with the corvette governer
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#29 |
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Join Date: Feb 2011
Location: Brownwood, Texas
Posts: 421
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Re: My 377 build.
I would think I would want it to shift higher... considering this motor would actually be better in higher rpms, but in all reality, I really am not 100% sure.
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1983 Chevy lwb: 400 sbc destroked to 377, comp cams xe 268, Holley Street Dominator Intake, Holley Street Avenger 670 cfm, headers, flowmasters. SOLD 1998 Trans am, mostly stock with magnaflow catback My build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=454329 |
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#30 |
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Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: My 377 build.
well are you talking about wot shifting or just regular driving?
vacuum madulator controls in town and the governer controls wide open throttle
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#31 |
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Join Date: Jun 2008
Location: Lubbock, TX
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Re: My 377 build.
It's not necessarily where it shifts, it's what the engine can do. Shorter stroke equates to slower piston speed and less ring friction. Slower piston speed means it will rev higher to get the same piston speed. It's not tough to build a bottom end that can take it, it's the valve train that really needs correct parts built right to get 'er done.
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#32 |
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Join Date: Feb 2011
Location: Brownwood, Texas
Posts: 421
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Re: My 377 build.
I'm talking about WOT
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1983 Chevy lwb: 400 sbc destroked to 377, comp cams xe 268, Holley Street Dominator Intake, Holley Street Avenger 670 cfm, headers, flowmasters. SOLD 1998 Trans am, mostly stock with magnaflow catback My build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=454329 |
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#33 |
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Join Date: Jul 2009
Location: washington
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Re: My 377 build.
ok well try out a corvette governer which shifts around 5600 i think and you should be happy with that
what kind of cam do you have? you want it to shift to a little after your powerband starts when it drops the rpm otherwise manual shift it and dont forget a trans go shift kit to keep it alive under power
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#34 |
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Join Date: Feb 2011
Location: Brownwood, Texas
Posts: 421
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Re: My 377 build.
I have a comp cams xe268h. I believe the powerband is 1500-5800 rpm
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1983 Chevy lwb: 400 sbc destroked to 377, comp cams xe 268, Holley Street Dominator Intake, Holley Street Avenger 670 cfm, headers, flowmasters. SOLD 1998 Trans am, mostly stock with magnaflow catback My build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=454329 |
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#35 |
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Join Date: Feb 2011
Location: Brownwood, Texas
Posts: 421
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Re: My 377 build.
If I manually shift it, is it going to hurt anything to shift it past 4k? Cause sometimes I'll manually shift it and shift it at around 4500 and it sounds like it's revving really high when I do that.
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1983 Chevy lwb: 400 sbc destroked to 377, comp cams xe 268, Holley Street Dominator Intake, Holley Street Avenger 670 cfm, headers, flowmasters. SOLD 1998 Trans am, mostly stock with magnaflow catback My build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=454329 |
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#36 |
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Join Date: Sep 2010
Location: Quinlan, TX
Posts: 83
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Re: My 377 build.
We used to build a lot of 377's for our dirt racecars, if they are done right, they make great power in the upper rpm's... like 5000 and up, the only down side is that the 400 block is a little weak in the main webs for high rpm, if it has main girdles, they will live comfortably at 7500 or so. One of the machine shops we used built us one of these from a 350 block....bored it .125 over and it lasted a long time. I don't know how much heating issues it would cause on the street though.
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#37 |
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Join Date: Jul 2009
Location: washington
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Re: My 377 build.
377's produce a unique sound unlike any other manual shift will not hurt anything and you will be fine spinning it to 5800, back in the day poeple would spin sbc and big blocks alike to 7g stock
5800 is a safe rpam that nearly any sbc should attain safely and isnt to hard on the engine
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#38 | |
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Join Date: Feb 2011
Location: Brownwood, Texas
Posts: 421
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Re: My 377 build.
Quote:
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1983 Chevy lwb: 400 sbc destroked to 377, comp cams xe 268, Holley Street Dominator Intake, Holley Street Avenger 670 cfm, headers, flowmasters. SOLD 1998 Trans am, mostly stock with magnaflow catback My build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=454329 |
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#39 | |
Slugish
![]() Join Date: Jan 2005
Location: Earlysville, Va.
Posts: 1,024
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Re: My 377 build.
Quote:
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#40 |
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Join Date: Feb 2011
Location: Brownwood, Texas
Posts: 421
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Re: My 377 build.
I don't have a thumpr, I have the xe 268. I might have gone with the thumpr but I read that they are all bark and no bite.
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1983 Chevy lwb: 400 sbc destroked to 377, comp cams xe 268, Holley Street Dominator Intake, Holley Street Avenger 670 cfm, headers, flowmasters. SOLD 1998 Trans am, mostly stock with magnaflow catback My build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=454329 |
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#41 |
Slugish
![]() Join Date: Jan 2005
Location: Earlysville, Va.
Posts: 1,024
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Re: My 377 build.
oh for some reason Ithought you said you had a thumper . Yea bark but no bite is what I have heard .
Ihave a xe 268 now & have boght the xe274 but my 268 sounds a lot tamer than yours ? maybe the exhaust Ihave full lenghth headers > 3 in. collecter into one flowmaster , 3 in in & 2- 2.5 's out dumped behind rear wheel |
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#42 |
Slugish
![]() Join Date: Jan 2005
Location: Earlysville, Va.
Posts: 1,024
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Re: My 377 build.
oh for some reason Ithought you said you had a thumper . Yea bark but no bite is what I have heard .
Ihave a xe 268 now & have boght the xe274 but my 268 sounds a lot tamer than yours ? maybe the exhaust Ihave full lenghth headers > 3 in. collecter into one flowmaster , 3 in in & 2- 2.5 's out dumped behind rear wheel. I WONDER if Ihad true duels would it sound better. |
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#43 |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: My 377 build.
have the small thumpr in my truck, alot of bite for a 420 hp 377
have to add 1.6 ratio rockers to the exhaust to make it more like a single pattern cam, really wakes up the cam, not to mention if you set the timing curve right, im sure if i had some better flowing heads and intake i would be at about 500 hp and great streatability bark with bit i tell you, the bigger cams for thier size do not deliver i admit, even then if your going to put a massive cam in why go thumpr?
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#44 |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: My 377 build.
its ok just got to build trust with you and your engine, im the same way with all my engines
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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