SD 980 heads info
Thank you all for your reply's, On the intake, I got it with the heads, I know it did not come on the SD that year, I found some info on the manifold that said when Pontiac stop making it, M Thompson did some from 63 to 65 ??? And it would be cool to see how different they are from stock, The person I got them from had the heads on a 389 with a single 4BBL and said the 64 GTO with 3:55 ripped, Very fast and pulled well to 5500RPM. Said before he owned it it had the M. Thompson Intake on it?? Never ran it himself. Was also told Crane did some BBC heads. Seems like he did a variety of manufactures stuff . Was he affiliated with Crane Cams? Had a large Fireball Crane Cam and Valve train parts??
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