new bbf builds in process

well i help a buddy put together a cheap 460, stock crank, eagle rods, some racetech pistons with some tfs Cobra Jet cnc ported heads from trick flow, solid roller camshaft in a 3000lb car he has ran 5.30s on a 275 radial. with a 200 shot in the plate.


now i have two more engines to build for people wanting to run that or faster


starting to piece them together


starting point

i have 2 dove a blocks

going .80 over on both
4 bolt conversion on both

4.500 stroke 4340 cranks
some steel rods 6.70
some racetech pistons 12.1 to 12.5 compression flat tops

going to use the 360 cnc version a460 heads bolt on no porting

solid roller camshaft around 850 lift set up for nitrous

trying to find used intakes rockers etc to make builds cheap as possible,

expecting 850hp on motor and up to 1200hp on the spray

using fox body oil pans and factory style pump high volume or kasse
double rolling timing chain two pins

project cheap build is underway. trying to keep both motors under 8500 a piece total cost, will be hard but working on it now. only differance in motors one will be set up for 595 bracket racing with occasional use of spray, the other one will be set up for occasional bracket but mainly a nitrous only motor.

with the DOVE block I would not use the 6.7 rods with the 4.5 stroke brings the pistons way down the bore..... I would go with the 6.8 rods... or get a D9TE block it has longer cylinder walls....

the Dove blocks have the 4 bolt conversions, we use the 6.7 rod for a better ring pack and a standard bbc wrist pin with a 1.80 thicknes the piston due to the nitrous to get a better ring pack, do you feel the shorter rod side loads the block? we usually use a coated skirt .I know the d9 block is supposed to have longer cylinder walls but it took forever to find these two dove blocks and when we spray them i would rather have the crank stay still. we have them both filled to water pump with block fill.

also what is the best single 4 intake for a460s our the box right now?

I just gave you the info, what you do with it is your decision just don't expect long life out of it... have a nice day

the Coug wrote:with the DOVE block I would not use the 6.7 rods with the 4.5 stroke brings the pistons way down the bore..... I would go with the 6.8 rods... or get a D9TE block it has longer cylinder walls....

X2 ... the more the piston rocks at the bottom of the bore and ring seal is lost for a brief moment, it will NEVER recover and some performance will also be lost. However, there are people who just don't care about that stuff because the engine seems to run fine and the power sure seems better, mostly because the engine is simply bigger.

well have not purchased the rods yet, i guess i will sacrifice on the ring pack a little if the 6.8 rod is that much better, anything else right off hand for suggestions?

I don't see the 6.8" rod being an issue....just gotta get the ring widths, intake valve relief depth, etc worked out.

You should use a tool steel pin.

How far are you going to run the piston from the cyl. head?

Why only 12:1 ?

usually 12.5 to 12.1 compression. flat top piston, i do not like pop up pistons, also leave about .060-.080 quench i have had better luck on the nitrous motors with the piston in the hole some, as long as the motor makes around 850-900 that should be plenty just want the motors to handle Nitrous on a regular basis.

And Lem or Charlie feel free to speak up you will not hurt my feelings, i have purchased several cams and sets of heads from you and i will listen the cam you did for my 532 worked great on nitrous.

Hell, I thought I did speak up

Like I said, run a stout pin. Make sure the piston is not too thin between the intake relief and the top ring groove.

I agree, run the piston below deck rather than a crazy thick head gasket. I'm sure you have observed that the spray engines are not as fussy about ign. timing with the piston to head opened up.

AND ... run the correct gasoline for the compression ratio being used.

What combustion chamber volume are you using to get that 12/1...?  A flat-top piston about .020" down the hole with a 74cc chamber is closer to 13/1 compression with a 557... an 88cc chamber A head will be around 11.3/1 compression.

tfs part number 5451t804-c03 this is the 360 cnc version we will bolt on with no additional porting for now

85cc head or 83cc cannot remember

going to order a custom set of Race Tech pistons once the final measurements are done at the machine shop he said should be about 12.1 to 12.5 hopefully .350 down on the ring land, and around 1.35 to 1.25 on the compression height. with a good Pin

studly wrote:tfs  part number 5451t804-c03  this is the 360 cnc version we will bolt on with no additional porting for now

85cc  head  or 83cc cannot remember

going to order a custom set of Race Tech pistons once the final measurements are done at the machine shop he said should be about 12.1  to 12.5  hopefully .350 down on the ring land, and around 1.35 to 1.25 on the compression height. with a good Pin

I suspect that you miss my point.... .350" 'down' is okay but, if the intake valve relief is .300" deep it's not where you need to be.

will try to keep a min .350 with valve relief thanks

That's more like .450 to .500 down the piston side.