Help From You C4 Owners
Thread Starter
Pro
Joined: Feb 2007
Posts: 548
Likes: 1
From: Victoria VA
Help From You C4 Owners
I have a 77 that I'm doing some engine upgrades here is what I am doing.
Heads- 1988 chevy L98 corvette 58cc chambers
valves- stainless steel 1.94 intake 1.50 exhaust
springs-Comp. Cams- part# 986 1.43 o.d Dia. 132@1.75 seat load 293@1.25 open load 1.15 coil bind and 322 lbs. rate. Retainers- Comp.Cams- part# 740-16 super lock retainers 10deg. lock angle
Rockers- Comp. Cams- part# 1417-16 magnum rollers 1.52 ratio with 3/8 rocker stud.
WORK
Complete valve job, bronze guides, cut for PC seals, machine spring seat ,drill and helicoil bolt holes surfaced .005. pressure test, and shim springs.
GM 21/2" D port exhaust manifolds
Cam Kit- Comp Magnum 270H with lifters & timing chain
Edelbrock Performer RPM intake
Holley 650 Double Pumper Dual Feed
TH350 with shift kit
3.70 rear
My main questions are what head gasket and head bolts do I need to use. I hope you all can help because I want to get this job done.
THANKS
Heads- 1988 chevy L98 corvette 58cc chambers
valves- stainless steel 1.94 intake 1.50 exhaust
springs-Comp. Cams- part# 986 1.43 o.d Dia. 132@1.75 seat load 293@1.25 open load 1.15 coil bind and 322 lbs. rate. Retainers- Comp.Cams- part# 740-16 super lock retainers 10deg. lock angle
Rockers- Comp. Cams- part# 1417-16 magnum rollers 1.52 ratio with 3/8 rocker stud.
WORK
Complete valve job, bronze guides, cut for PC seals, machine spring seat ,drill and helicoil bolt holes surfaced .005. pressure test, and shim springs.
GM 21/2" D port exhaust manifolds
Cam Kit- Comp Magnum 270H with lifters & timing chain
Edelbrock Performer RPM intake
Holley 650 Double Pumper Dual Feed
TH350 with shift kit
3.70 rear
My main questions are what head gasket and head bolts do I need to use. I hope you all can help because I want to get this job done.
THANKS
Race Director
Joined: Sep 2003
Posts: 16,838
Likes: 341
From: Database Error Indiana
I really like ARP head bolts. For gaskets you may want to decide how much compression you want to end up with and base your purchase on the thickness you need. I tend to like GM or Felpro.
Thread Starter
Pro
Joined: Feb 2007
Posts: 548
Likes: 1
From: Victoria VA
I would like to end up with no more than 10.25 to 1 comp. I kind of figured I would end up with some where around 9.6 to 10.0 to 1 with the head change going from 76cc down to 58cc and I'm not sure what if any difference the .005 resurfacing made. I'm open for all the advice and help I can get. Also do you know a ARP part number for the head bolts?
THANKS
THANKS
