107 Poston Camshaft

I actually think the 107 is a great cam for a low compression, stock headed motor. Will need a convertor though. The picture in my avatar is a full weight car (4136 lbs with driver) with a 430 ci, 8.48 CR, 107 cam, stock heads, B4B, quadrajet, 3500 stall,T400, 3.73 gears and Drag Radials. It runs 12.20's/30's and yes it does carry the front wheels off the line. This cam was designed with a poor flowing iron head in mind. The duration and overlap really make the heads work better than they should. The lift is relatively low, but with the velocity though the ports it seems to be fine. I drive it on the street all the time with no problems at all. ( other than every ricer and Mustang I see wanting to race!)

 

i dont think 430s have such low compresion
mine runs like crazy with a 288-94h cam

 

MY 430 has a deep dish piston sitting .080 in the hole. Actual CR is 8.48. I wish it had 10:1 but I will not change it at this point in it's life. Motor is tired and I am putting together a 464 for it.

 

Holy batpoop.. talk about no quench

 

freshen up the motor and supercharge it

 

i've actually considered doing that. My son wants to build a twin turbo 400, but this would be a good candidate for him.

 

it might seem like im not taking some people's advice on this topic, however, im not building this engine around the cam...ive decided to do the whole shabang. Ive also been talking with my buddy who used to race for poston and has build up a similar engine using the poston 107. He knows his **** and he re-assures me that it will work just fine.

 

I'm wondering why you asked this question here if your buddy was a racer for Poston. wouldn't he have had all the answers to begin with? I still think it's the wrong cam for a mostly street driven car.

 

of course he would have, i didnt find out till later

 

there still is much better cams out there
i would go with a single plane intake also

 

I can also tell you that the 107 cam is very hard to run on the street, with a stock Q-jet!! Ran this cam 18 years ago when it was new!! You better buy some wire drills and Doug Roes book on how to modify a Q-jet also!!:idea2: Because its gonna take you a lot of trial and error to get that car to idle in gear at a light!!:laugh: You may want to invest in a Holly, and make sure it has 4-corner idle setting screws !! Really I, along with many other Buick guys on this post did what you are doing 15-20 years ago!! We are trying to tell you what would work and make your car faster for the least amount of money!! Your friend at Poston is not very experienced in Buick, if the 107 is his cam of choice?ou: Sounds like he just wants to unload a bunch of junk in his garage to me!!Try it, and you will see that many other Buick's at the GS nationals are running faster then you ,without all the problems of stalling and rough idle. A large cam may sound cool, but it does not guarantee a fast Buick!! Or Chevy or Mopar etc.!! You should spend some money on Head porting at Gessler and forget the huge cam!! I have won and beat many other cars with much larger cams then mine because of the combination of parts! The #1 main part to making any engine run is GOOD HEADS!!!:beer

 

I agree that there are far better cams now that the old 107!

The old Green Dinosaur has been running 17 years with a 10.5 compression, home ported heads, three different intakes, fuel injection to an 850 Holley, etc. It sees more street miles than 1/4 or 1/8 mile runs and it does very well with this old cam. I would like to upgrade the cam before long but it keeps doing this well so why change.:laugh:

 

Good Street cam that nobody mentions ta292-02..a little hotter than postons gs113 cam,can use stock rockers 9.5 compression only draw back requires a 3000-3500 converter althouth i use about a 2500 but does creep some at the light. Ive have turned a 13.39 101.92 this is at almost 5000 ft.elevation.If i could run down where there is some air might get into the 12's

 

well, i guess ill be letting u guys know how it actually fairs in my car in about a month when i finish the buildup

 

I think your compression is going to be around 8.7 to 9.0. I think 72 blocks still had round coolant passages(someone on here will know), if so you could you the steel shim head gasket that stage 1's originally had.

Also I have ran the 113 and 113a, they are great street cams and I would recommend one. Also TA has many offerings for street engines now.

Hope this helps


Kevin

 

hey chris!
ya, brad talked to me this morning. What kind of parts/knowledge do u have that could help me out? Apparently u have some forged pistons? Are they in good shape?

thanks man!

and kevin....what would coolant passages have to do with cylinder compression?

 

If it has the early coolant passages in the block, you could use thin steel shim head gaskets that would increase compression.

 

ic what u mean about the gasket...but how would i have 8.7:1-9:1 c/r when i put in 10:1 pistons? doesnt make sense.

 

the pistons are rated 10 to 1 with the right deck height
the right gasket
the right head cc
bore size and stroke
these are all added to gether for that ratio
if your motor is off you will not have the "advertised" 10 to 1
yes advertised as a selling point not a fact