1988 pontiac gta transam 350 tpi

the cam operating range - 1800-5800 rpm
duration advertised - 268 degrees/276 degrees
duration @ .50 lift - 218/224
valve lift -.570/.565
lobe separation angle 113 degrees



Stealth ram intake manifold
headers 1 3/4 hooker headers



the heads in question

AFR# 1034 - 195cc Heads, Straight Plug, 65cc, .600 lift
AFR# 1036 - 195cc Heads, Straight Plug, 75cc, .600 lift
AFR# 1038 - 195cc Heads, Angle Plug, 75cc, .600 lift
AFR# 1040 - 195cc Heads, Angle Plug, 65cc, .600 lift

 

Still running the stock flat top pistons?

I would suggest the AFR 195 Eliminator angle plug 65cc chambers. If you go up to the 75cc you will lower your compression ratio.

 

still running the stock pistons that is correct.

 

1040's

 

I used 1034's, milled to achieve 62cc combustion chambers. The cam you describe sounds like the Comp XFI268.

Bill

 

How is the clearance with the straight plug angle with your headers? I have the 1038's on my 383 and have plenty of room around the primarys.

 

Good plug - to - header clearance. Easy plug changes with a short sparkplug socket; plenty of sparkplug wire boot clearance using MSD 90* plug terminals.

Bill

 

that is correct. lol. i dont know what clearance i would have with the headers if i put on if i use straight angle. Would that make a difference if i go with angled?

 

I would suggest calling AFR to discuss your head / header combo and get their advice. I don't have any experience with any other headers & AFR straight plug heads; the heads & headers went on my motor at the same time.

Bill

 

I have the 1040's. Very happy. Good spark plug clearance with my 2055's.

 

I had this exact same question since I have the xfi268 as well, thanks for starting the thread OP!