pair of 502's 590 hp 15k
 

I have a pair of recently gone thru 502's not yet installed built by bob at thunder boats dyno time only had 590 hp with very conservative tune come carb to pan with oil coolers and ignition text for pics and i can put you in touch with bob for any questions if you are a serious buyer need to get 15k for the pair or 8000 for 1 Gene 617 957 1832 my fountain they were going in is sold

cast iron world heads on these

I've used this engine builder with good results. I am also familiar with this set of engines, as they were built just before my set. Impressive but conservative, reliable packages!

If you need reliable strong torque, I would not hesitate to buy these! Price is also very fair!

thanks for the kind words

here is what i was told was done to them
HUNDERBOLT ENGINES
Mercruiser 502 -500hp– 575+ hp engine package
1-502 gen 5 block , std bore , 4 bolt mains ,one pc rear main , honed , ck aline bore , cleaned, prepped , new cam bearings
2- steel crankshaft, 4.00 stroke , polished , balanced with assemble .one pc rear main ,cleveite 77 bearings
3- 7/16 dimple connecting rods , performance rod bolts, cleveite 77 performance bearings
4-forged std 502 performance pistons , performance wrist pins , mahl plasma rings , 9;1 compression , 93 + octane
5- crane marine performance hyd roller cam, mhp 300, hyd roller lifters , cloyes timing chain, crane roller rockers , 3/8 pushrods .080 , timing cover , degreed + 4
6-World/merlin after market performance heads , grump model, ss valves , performance valve job, valve springs , harden retainers , port clean up , surface , proper spring psi for hyd roller cam. alum valve covers
7-team G alum intake , spacer, throttle plate , 830 Holley carb , flame arrestor, fuel lines , fuel filter bracket
8- 8-Qt oil pan, hv oil pump, remote oil system , hoses, hd oil cooler , race oil and race filter
9- mercruiser thunder bolt ignition system , dist, brain box, new cap, rotor, spark plugs
32 degree total advance
10- water pump , with pulley,
11- harmonic balancer , lower pulley, alt bracket, mis adjusting brackets , engine wiring harness, alternator , ,bravo flywheel,
12- mercruiser sea pump with fuel pump , new impeller kit ,
13- Build up on engine, assemble, blue print , set clearances, degree cam, set lifter per loads,
14- dyno engine , break in, oil change , load test , performance test , air fuel adjustment , set timing . change oil with VR-1 20-50 racing oil
15-dress engine with marine hardware , paint engine ,
16- hp starter , with spec bolts ,

ttt

ttt

motors are sitting on stands on pallets i will also build boxes for them out of plywood and drop at local shipper no charge

looking to repower?

to the top for a nice pair of motors built by a pro

sunday bump