347 build help

vpap1 · Jan 26, 2011

So I have a 90 GT full stock suspension and full weight. Rebuilding the motor with a 347 stroker from coast high perfomance with one of there 800 hp internal engines. I have the trickflow top end kit, wtih a stage 2 cam from trickflow, 80mm maf, 75 mm TB from TFS, 30 # injectors, under drive pullies, 255lph fuel pump and mallory fuel pressure regulator. Car has 3.73 gears and will have upgraded 28 spline axles. I'm pretty sure the CHP block is stock deck and the heads I have are unmilled and can hande .600 of lift. Questions are, if I stick the cam in straight up, with I have PTV issues, also can I run 1.7 roller rockers instead of the 1.6's that come in the kit? Also, I know I need to run a solid lifter to check for pushrod length but would you know at least what size checker I would need, if not the actual length? I am running nitrous with this setup and am shooting for 11.5 quarter times on 275 drag radials. Any rwhp estimates and know with 75 or 100 hp shot is a good start?
thanks for all the support
V

FastDriver · Jan 27, 2011

Tough questions for anyone who hasn't run that exact setup. The only one I believe I can answer is the question of 1.6s vs. the 1.7s. Lift itself isn't a factor in reference to PTV clearance. Nevertheless, check for PTV contact the right way, and though you can use other people as a rule of thumb, don't take their word for your engine.

clement · Jan 27, 2011

the lobes on those cams are notorious for being all over the place. so the only way to know if you are going to have ptv issues with your combo is to check your cam on your engine. .600 lift spring ratings dont mean ****. you need to find out what spring rate that cam needs for open and closed and at what installed height. if the springs on your heads dont check out on a valvespring checker you toss them in the trash and buy new valvesprings. yes, you will have to have solid lifter and adjustable pushrod in order to check ptv and determine correct pushrod length.

this is the adj pushrod checker you need for a 302

http://www.summitracing.com/parts/CCA-7905-1/

NIKwoaC · Jan 27, 2011

It should be mentioned, PtV is hugely affected by the type of pistons and what style valve reliefs they have.

2000xp8 · Jan 28, 2011

Honestly, after reading your question, how you phrased things and lack of mention of the piston, it would be in your best interest to have your engine builder spec out and assemble the entire long block with your heads.

347 build help

vpap1

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FastDriver

I was uncomfortably high & wearing a helmet

clement

NIKwoaC

中國製造

2000xp8

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347 build help

vpap1

Member

FastDriver

I was uncomfortably high & wearing a helmet

clement

NIKwoaC

中國製造

2000xp8

Similar threads

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