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Forum: Pontiac - Boost 04-03-2024, 07:34 PM
Replies: 16
Views: 901
Posted By Prototyper
Correction, in response to grandam1979 post not...

Correction, in response to grandam1979 post not the OPs
Forum: Pontiac - Boost 04-03-2024, 07:31 PM
Replies: 16
Views: 901
Posted By Prototyper
In response to the OPs post, I did a bunch of...

In response to the OPs post, I did a bunch of work on an Interceptor replica made by the same guy that did the movie cars here in Australia. There's a starter motor inside the blower case which...
Forum: Pontiac - Street 09-25-2023, 08:54 PM
Replies: 7
Views: 718
Posted By Prototyper
On another note with these heads, previous...

On another note with these heads, previous builder had cut valve spring seats down approx 0.120" but only 1.380" diameter as pictured. It had Comp 995 springs fitted which at 1.437" OD obviously...
Forum: Pontiac - Street 09-25-2023, 07:16 PM
Replies: 7
Views: 718
Posted By Prototyper
Hi All, Advice noted and appreciated. ...

Hi All,
Advice noted and appreciated.
Regards
Jarrod
Forum: Pontiac - Street 09-25-2023, 06:45 AM
Replies: 7
Views: 718
Posted By Prototyper
197 head work

Hi,
Started cleaning up my 197 heads. scope is gasket matching, bowl blend, port cleanup and chamber polish.

Can/should the material below the intake guide as pictured be completely removed and...
Forum: Pontiac - Street 09-21-2023, 06:10 PM
Replies: 10
Views: 392
Posted By Prototyper
Thanks for that info Paul. I always knew that...

Thanks for that info Paul.
I always knew that cam was a poor choice since I've owned this car, 71 TA 4 Speed....from memory was around 210 cranking psi, lots of torque with very little throttle...
Forum: Pontiac - Street 09-21-2023, 10:11 AM
Replies: 10
Views: 392
Posted By Prototyper
Thanks, Detonation is my concern, was hoping I...

Thanks,
Detonation is my concern, was hoping I may be able to compensate with later IVC.
I'm in Australia and run 98 octane which is the same as your 93 but it did ping previously with a less than...
Forum: Pontiac - Street 09-21-2023, 10:06 AM
Replies: 10
Views: 392
Posted By Prototyper
Thanks, Detonation is my concern, I'm pretty...

Thanks,
Detonation is my concern, I'm pretty sure they're solid domes so will keep that up my sleeve
Forum: Pontiac - Street 09-21-2023, 09:24 AM
Replies: 10
Views: 392
Posted By Prototyper
Engine is still in vehicle so I can only get a...

Engine is still in vehicle so I can only get a pic of the lower skirt at BDC, have to contortion myself to see any more via a mirror on a stick let alone get a pic!!
I've seen pics of Venolias with...
Forum: Pontiac - Street 09-21-2023, 08:59 AM
Replies: 10
Views: 392
Posted By Prototyper
Piston ID

Hi All,
Pulled the 197 Heads from my 71 455HO recently. Found it has domed pistons fitted as per the attached pic. Can anyone identify them?
I've used a mirror and can see stampings SPDMS, A & 5...
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