Hello,...

I need some advice please, How do I go about modding the 4 centre holes on a TPI base to make them align with the old style bolt pattern, can this be done at home or must i take it in have the holes welded shut and drilled at the proper angles?? thanks any advice or direction would be Great, thanks GTA.......

 

What intake are you going to use?

LB9GTA

 

Stock one, the 4 centre intake bolt holes are at a 72* angle, (1987 - 1992 ) I need these holes to be at a 45* angle to match the older style head bolt pattern, ALL 45* .....you know who screwed up and forgot to order the proper parts.... . GTA

 

Does any one happen to have a pic of the holes elongated? any info would be great, ...GTA

 

I can take some pictures, have the manifold off the car laying on a table.

The angle is actually 90 degrees, to the surface of the intake face of the head.

 

Mad Max,

A pic is always worth a thousand words....GTA

 

believe it or not, i never used teh middle bolt holes, i just sealed it really well with RTV, and left it alone. Works great, and i have the old style heads, $92 castings.

 

really??

i still will feel better knowing that there are bolts holding everthing together.....i do not doubt you at all i just wonder how long untill it does develop a leak......GTA...

 

Hope these help.

 

Thanks they do help..... GTA.....

 

I believe it, but would NOT recommend doing this.

 

Jack,...

just wondering would you happen to have a picture of this intake on your car, minus the 2 centre bolts holding things together?? GTA.......

 

if you want a lil better idea of the pic for both holes just look at a superram intake its drilled to accept both styles.

 

ya sure i'll try to get a picture of it, the reason i didin't bother was the master mechanic who let me biuld the engine in his shop said that the intake would fit and i didn't need to be worrying about a leak. He has been doing this for over 60 years, so i believed him. BTW, he is 93 and used to be in the japanese concentration camps, so he really has been doing this for 60 years....

brett

 

I fit a newer style TPI intake to some RPM Performer heads. I used a stepped drill bit and just estimated the angle. It worked well. It has been three years and no leaks. I used the ARP bolts with a large flange on the head of the bolt.